Definition of "demean"

It was, of course, Mrs. Sedley's opinion that her son would demean himself by a marriage with an artist's daughter.

1847 January – 1848 July, William Makepeace Thackeray, chapter 6, in Vanity Fair […], London: Bradbury and Evans […], published 1848

But now, as our obdurate clergy have with violence demeaned the matter.

1644, John Milton, Areopagitica; a Speech of Mr. John Milton for the Liberty of Unlicenc’d Printing, to the Parlament of England, London: [s.n.]

they have demean'd themselvesLike men born to renown by life or death.

c. 1591–1592 (date written), William Shakespeare, “The Third Part of Henry the Sixt, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene iv]

They answered […] that they should demean themselves according to their instructions.

1702–1704, Edward [Hyde, 1st] Earl of Clarendon, “(please specify |book=I to XVI)”, in The History of the Rebellion and Civil Wars in England, Begun in the Year 1641. […], Oxford, Oxfordshire: Printed at the Theater, published 1707

Pursu'd him streight, in mynd to bene ywroken / Of all the vile demeane, and vsage bad

1596, Edmund Spenser, “Book VI, Canto VI”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie, stanza 18

‘When thou hast all this doen, then bring me newes / Of his demeane […].’

1596, Edmund Spenser, “Book V, Canto V”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie

with grave demean and solemn vanity

1739, Gilbert West, A canto of the Fairy Queen (later called On the Abuse of Travelling)

Concerning FE estimation, it makes no difference whether you demean the data with unit-specific means computed on (balanced) T observations per unit, or with unit-specific means computed on (unbalanced) Ti observations per unit.

2013, Hans-Jürgen Andreß, Katrin Golsch, Alexander W. Schmidt, Applied Panel Data Analysis for Economic and Social Surveys‎, page 177